+501 The height (in meters) of a shot cannonball follows a trajectory given by $h(t) = -4.9t^2 + 14t - 0.4$ at time (in seconds). As an improper fraction, for how long is the cannonball above a height of 6 meters?
+37146 https://web2.0calc.com/questions/the-height-in-meters-of-a-shot-cannonball-follows
